Garage Conversion Cost Calculator
Estimate the cost of converting a garage into a habitable room, a bedroom, studio, home office or granny flat. Insulation, the floor, a new door or window, and heating/cooling are the main costs, plus approval if it becomes habitable.
Your garage conversion details
Your estimate sits within the typical range.
Turning a garage into a habitable room usually needs council approval and must meet building standards for insulation, ventilation, light and egress, a garage as-is rarely complies. Approval protects you at resale.
A garage conversion is one of the cheapest ways to add a room because the structure and roof already exist. The real work is making it habitable, insulation, flooring, light, ventilation and heating, and getting it approved.
💰 Ways to save
- Keep plumbing out of it where you can, a dry room (bedroom, office) is far cheaper than one with a bathroom or kitchenette.
- Get approval, an unapproved conversion can cause problems at sale and insurance.
- Reuse the existing slab and structure, that is the saving over building an addition from scratch.
or from $119/week over 5 years , indicative finance
How we estimate this
A garage conversion in Australia typically costs around $12,000 to $25,000 for a basic habitable room in 2026, rising to $40,000 to $70,000 for a self-contained studio with a kitchenette and bathroom. Approval, heating and replacing the garage door add to that.
Pricing reviewed: November 2026.
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Pricing reviewed November 2026. Indicative Australian costs, not a quote.
Understanding garage conversion costs in Australia
A garage conversion in Australia typically costs around $12,000 to $25,000 for a basic habitable room in 2026, rising to $40,000 to $70,000 for a self-contained studio with a kitchenette and bathroom. Approval, heating and replacing the garage door add to that.
It is cheaper than a new addition because the structure already exists, the cost is in making it habitable and compliant. Adding plumbing for a kitchenette or bathroom is the biggest single jump, along with council approval.
Frequently asked questions
How much does a garage conversion cost in Australia?
Roughly $12,000 to $25,000 for a basic habitable room in 2026, and $40,000 to $70,000 for a studio with a kitchenette and bathroom. Approval and services add more.
Do I need council approval to convert a garage?
Usually yes, if it becomes a habitable room it must meet building standards for insulation, ventilation, light and egress, which a garage rarely does as-is. Approval also protects you at resale.
Are you a renovation builder?
Everyone on this page is working out what garage conversion costs because they are ready to hire. Put your business right beneath the calculator, in your state, so you are who they find. From $50/mo.